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2019年03月13日 | STM32F4开发板----外部中断（003）

2019-03-13 来源：eefocus

外部中断

1 初始化参数

/**

* @brief EXTI Init Structure definition

typedef struct

{

uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.

This parameter can be any combination value of @ref EXTI_Lines */

EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.

This parameter can be a value of @ref EXTIMode_TypeDef */

EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.

This parameter can be a value of @ref EXTITrigger_TypeDef */

FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines.

This parameter can be set either to ENABLE or DISABLE */

}EXTI_InitTypeDef;

外部中断库函数

/* Exported macro ------------------------------------------------------------*/

/* Exported functions --------------------------------------------------------*/

/* Function used to set the EXTI configuration to the default reset state *****/

void EXTI_DeInit(void);

/* Initialization and Configuration functions *********************************/

void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);

void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);

void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);

/* Interrupts and flags management functions **********************************/

FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);

void EXTI_ClearFlag(uint32_t EXTI_Line);

ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);

void EXTI_ClearITPendingBit(uint32_t EXTI_Line);

2 配置过程

[..] In order to use an I/O pin as an external interrupt source, follow steps

below:

(#) Configure the I/O in input mode using GPIO_Init()

(#) Select the input source pin for the EXTI line using SYSCFG_EXTILineConfig()

(#) Select the mode(interrupt, event) and configure the trigger

selection (Rising, falling or both) using EXTI_Init()

(#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()

[..]

(@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx

registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

其中

EXTI_GetFlagStatus()先判断中断是否使能，使能之后才去判断中断标志位

EXIT _GetFlagStatus()直接判断状态标志位

扩展，所有stm32中断处理函数入口

WWDG_IRQHandler PVD_IRQHandler

TAMP_STAMP_IRQHandler RTC_WKUP_IRQHandler

FLASH_IRQHandler RCC_IRQHandler

EXTI0_IRQHandler EXTI1_IRQHandler

EXTI2_IRQHandler EXTI3_IRQHandler

EXTI4_IRQHandler DMA1_Stream0_IRQHandler

DMA1_Stream1_IRQHandler DMA1_Stream2_IRQHandler

DMA1_Stream3_IRQHandler DMA1_Stream4_IRQHandler DMA1_Stream5_IRQHandler DMA1_Stream6_IRQHandler

ADC_IRQHandler CAN1_TX_IRQHandler

CAN1_RX0_IRQHandler CAN1_RX1_IRQHandler

CAN1_SCE_IRQHandler EXTI9_5_IRQHandler

TIM1_BRK_TIM9_IRQHandler TIM1_UP_TIM10_IRQHandler

TIM1_TRG_COM_TIM11_IRQHandler TIM1_CC_IRQHandler

TIM2_IRQHandler TIM3_IRQHandler

TIM4_IRQHandler I2C1_EV_IRQHandler

I2C1_ER_IRQHandler I2C2_EV_IRQHandler

I2C2_ER_IRQHandler SPI1_IRQHandler

SPI2_IRQHandler USART1_IRQHandler

USART2_IRQHandler USART3_IRQHandler

EXTI15_10_IRQHandler RTC_Alarm_IRQHandler

OTG_FS_WKUP_IRQHandler TIM8_BRK_TIM12_IRQHandler

TIM8_UP_TIM13_IRQHandler TIM8_TRG_COM_TIM14_IRQHandler

TIM8_CC_IRQHandler DMA1_Stream7_IRQHandler

FSMC_IRQHandler SDIO_IRQHandler

TIM5_IRQHandler SPI3_IRQHandler

UART4_IRQHandler UART5_IRQHandler

TIM6_DAC_IRQHandler TIM7_IRQHandler

DMA2_Stream0_IRQHandler DMA2_Stream1_IRQHandler

DMA2_Stream2_IRQHandler DMA2_Stream3_IRQHandler

DMA2_Stream4_IRQHandler ETH_IRQHandler

ETH_WKUP_IRQHandler CAN2_TX_IRQHandler

CAN2_RX0_IRQHandler CAN2_RX1_IRQHandler

CAN2_SCE_IRQHandler OTG_FS_IRQHandler

DMA2_Stream5_IRQHandler DMA2_Stream6_IRQHandler

DMA2_Stream7_IRQHandler USART6_IRQHandler

I2C3_EV_IRQHandler I2C3_ER_IRQHandler

OTG_HS_EP1_OUT_IRQHandler OTG_HS_EP1_IN_IRQHandler

OTG_HS_WKUP_IRQHandler OTG_HS_IRQHandler

DCMI_IRQHandler RYP_IRQHandler

HASH_RNG_IRQHandlerFPU_IRQHandler

这里中断函数对应关系

EXPORT EXTI0_IRQHandler ----> EXTI_Line0

EXPORT EXTI1_IRQHandler ----> EXTI_Line1

EXPORT EXTI2_IRQHandler ----> EXTI_Line2

EXPORT EXTI3_IRQHandler ----> EXTI_Line3

EXPORT EXTI4_IRQHandler ----> EXTI_Line 4

EXTI9_5_IRQHandler —-> EXTI_Line 5-9

EXTI15_10_IRQHandler —-> EXTI_Line 10-15z

3.3 初始化实例

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);//PA0 连接中断线0

/* 配置EXTI_Line0 */

EXTI_InitStructure.EXTI_Line = EXTI_Line0;//LINE0

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//中断事件

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //上升沿触发

EXTI_InitStructure.EXTI_LineCmd = ENABLE;//使能LINE0

EXTI_Init(&EXTI_InitStructure);//配置

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;//外部中断0

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;//抢占优先级0

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;//子通道优先级2

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//使能外部中断通道

NVIC_Init(&NVIC_InitStructure);//配置

void EXTI0_IRQHandler(void)

{

delay_ms(10); //Ï消抖

if(WK_UP==1)

{

BEEP=!BEEP; //电平翻转

}

EXTI_ClearITPendingBit(EXTI_Line0); //清除LINE0上的中断标志

}

STM32F4 外部中断

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